Ch. 6: Aquatic Ecosystems (Oceans)

Estuaries occur only where freshwater meets the water of the ocean.

• True
• False

Organisms that live in estuaries most tolerate a wide range of _______________ & _______________.

• temperature and currents
• temperature and salinity

Estuaries are home to __________ __________ and _______________ __________.

• Salt Marshes and Mangrove Forests
• Salt Swamps and Magrove Marshes

Which one is NOT a benefit of estuaries?

• Prevents flooding
• Prevent soil erosion 
• Houses fish safely
• Act as barrier a protective barrier between the sea and land

What % of the Earth is covered by ocean water?

• 80%
• 81%
• 70%
• 71%

The oceans contain what % of the Earth’s water?

• 90%
• 97.5%
• 80%
• 87.5%

Where do ocean salts come from originally?

• From space by falling debris
• From land by wind and water

The flow of warm, oxygen rich water to the ocean depths is...

• Upwelling
• Downwelling

The flow of cold, nutrient-rich water toward the surface is...

• Upwelling
• Downwelling

The Ocean Floor is...

• Photic
• Aphotic
• Benthic